[linux-2.6-block.git] / arch / parisc / kernel / unaligned.c

/*
 *    Unaligned memory access handler
 *
 *    Copyright (C) 2001 Randolph Chung <tausq@debian.org>
 *    Significantly tweaked by LaMont Jones <lamont@debian.org>
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2, or (at your option)
 *    any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched/signal.h>
#include <linux/sched/debug.h>
#include <linux/signal.h>
#include <linux/ratelimit.h>
#include <linux/uaccess.h>
#include <asm/hardirq.h>
#include <asm/traps.h>

/* #define DEBUG_UNALIGNED 1 */

#ifdef DEBUG_UNALIGNED
#define DPRINTF(fmt, args...) do { printk(KERN_DEBUG "%s:%d:%s ", __FILE__, __LINE__, __func__ ); printk(KERN_DEBUG fmt, ##args ); } while (0)
#else
#define DPRINTF(fmt, args...)
#endif

#ifdef CONFIG_64BIT
#define RFMT "%016lx"
#else
#define RFMT "%08lx"
#endif

#define FIXUP_BRANCH(lbl) \
	"\tldil L%%" #lbl ", %%r1\n"			\
	"\tldo R%%" #lbl "(%%r1), %%r1\n"		\
	"\tbv,n %%r0(%%r1)\n"
/* If you use FIXUP_BRANCH, then you must list this clobber */
#define FIXUP_BRANCH_CLOBBER "r1"

/* 1111 1100 0000 0000 0001 0011 1100 0000 */
#define OPCODE1(a,b,c)	((a)<<26|(b)<<12|(c)<<6) 
#define OPCODE2(a,b)	((a)<<26|(b)<<1)
#define OPCODE3(a,b)	((a)<<26|(b)<<2)
#define OPCODE4(a)	((a)<<26)
#define OPCODE1_MASK	OPCODE1(0x3f,1,0xf)
#define OPCODE2_MASK 	OPCODE2(0x3f,1)
#define OPCODE3_MASK	OPCODE3(0x3f,1)
#define OPCODE4_MASK    OPCODE4(0x3f)

/* skip LDB - never unaligned (index) */
#define OPCODE_LDH_I	OPCODE1(0x03,0,0x1)
#define OPCODE_LDW_I	OPCODE1(0x03,0,0x2)
#define OPCODE_LDD_I	OPCODE1(0x03,0,0x3)
#define OPCODE_LDDA_I	OPCODE1(0x03,0,0x4)
#define OPCODE_LDCD_I	OPCODE1(0x03,0,0x5)
#define OPCODE_LDWA_I	OPCODE1(0x03,0,0x6)
#define OPCODE_LDCW_I	OPCODE1(0x03,0,0x7)
/* skip LDB - never unaligned (short) */
#define OPCODE_LDH_S	OPCODE1(0x03,1,0x1)
#define OPCODE_LDW_S	OPCODE1(0x03,1,0x2)
#define OPCODE_LDD_S	OPCODE1(0x03,1,0x3)
#define OPCODE_LDDA_S	OPCODE1(0x03,1,0x4)
#define OPCODE_LDCD_S	OPCODE1(0x03,1,0x5)
#define OPCODE_LDWA_S	OPCODE1(0x03,1,0x6)
#define OPCODE_LDCW_S	OPCODE1(0x03,1,0x7)
/* skip STB - never unaligned */
#define OPCODE_STH	OPCODE1(0x03,1,0x9)
#define OPCODE_STW	OPCODE1(0x03,1,0xa)
#define OPCODE_STD	OPCODE1(0x03,1,0xb)
/* skip STBY - never unaligned */
/* skip STDBY - never unaligned */
#define OPCODE_STWA	OPCODE1(0x03,1,0xe)
#define OPCODE_STDA	OPCODE1(0x03,1,0xf)

#define OPCODE_FLDWX	OPCODE1(0x09,0,0x0)
#define OPCODE_FLDWXR	OPCODE1(0x09,0,0x1)
#define OPCODE_FSTWX	OPCODE1(0x09,0,0x8)
#define OPCODE_FSTWXR	OPCODE1(0x09,0,0x9)
#define OPCODE_FLDWS	OPCODE1(0x09,1,0x0)
#define OPCODE_FLDWSR	OPCODE1(0x09,1,0x1)
#define OPCODE_FSTWS	OPCODE1(0x09,1,0x8)
#define OPCODE_FSTWSR	OPCODE1(0x09,1,0x9)
#define OPCODE_FLDDX	OPCODE1(0x0b,0,0x0)
#define OPCODE_FSTDX	OPCODE1(0x0b,0,0x8)
#define OPCODE_FLDDS	OPCODE1(0x0b,1,0x0)
#define OPCODE_FSTDS	OPCODE1(0x0b,1,0x8)

#define OPCODE_LDD_L	OPCODE2(0x14,0)
#define OPCODE_FLDD_L	OPCODE2(0x14,1)
#define OPCODE_STD_L	OPCODE2(0x1c,0)
#define OPCODE_FSTD_L	OPCODE2(0x1c,1)

#define OPCODE_LDW_M	OPCODE3(0x17,1)
#define OPCODE_FLDW_L	OPCODE3(0x17,0)
#define OPCODE_FSTW_L	OPCODE3(0x1f,0)
#define OPCODE_STW_M	OPCODE3(0x1f,1)

#define OPCODE_LDH_L    OPCODE4(0x11)
#define OPCODE_LDW_L    OPCODE4(0x12)
#define OPCODE_LDWM     OPCODE4(0x13)
#define OPCODE_STH_L    OPCODE4(0x19)
#define OPCODE_STW_L    OPCODE4(0x1A)
#define OPCODE_STWM     OPCODE4(0x1B)

#define MAJOR_OP(i) (((i)>>26)&0x3f)
#define R1(i) (((i)>>21)&0x1f)
#define R2(i) (((i)>>16)&0x1f)
#define R3(i) ((i)&0x1f)
#define FR3(i) ((((i)<<1)&0x1f)|(((i)>>6)&1))
#define IM(i,n) (((i)>>1&((1<<(n-1))-1))|((i)&1?((0-1L)<<(n-1)):0))
#define IM5_2(i) IM((i)>>16,5)
#define IM5_3(i) IM((i),5)
#define IM14(i) IM((i),14)

#define ERR_NOTHANDLED	-1
#define ERR_PAGEFAULT	-2

int unaligned_enabled __read_mostly = 1;

static int emulate_ldh(struct pt_regs *regs, int toreg)
{
	unsigned long saddr = regs->ior;
	unsigned long val = 0;
	int ret;

	DPRINTF("load " RFMT ":" RFMT " to r%d for 2 bytes\n", 
		regs->isr, regs->ior, toreg);

	__asm__ __volatile__  (
"	mtsp	%4, %%sr1\n"
"1:	ldbs	0(%%sr1,%3), %%r20\n"
"2:	ldbs	1(%%sr1,%3), %0\n"
"	depw	%%r20, 23, 24, %0\n"
"	copy	%%r0, %1\n"
"3:	\n"
"	.section .fixup,\"ax\"\n"
"4:	ldi	-2, %1\n"
	FIXUP_BRANCH(3b)
"	.previous\n"
	ASM_EXCEPTIONTABLE_ENTRY(1b, 4b)
	ASM_EXCEPTIONTABLE_ENTRY(2b, 4b)
	: "=r" (val), "=r" (ret)
	: "0" (val), "r" (saddr), "r" (regs->isr)
	: "r20", FIXUP_BRANCH_CLOBBER );

	DPRINTF("val = 0x" RFMT "\n", val);

	if (toreg)
		regs->gr[toreg] = val;

	return ret;
}

static int emulate_ldw(struct pt_regs *regs, int toreg, int flop)
{
	unsigned long saddr = regs->ior;
	unsigned long val = 0;
	int ret;

	DPRINTF("load " RFMT ":" RFMT " to r%d for 4 bytes\n", 
		regs->isr, regs->ior, toreg);

	__asm__ __volatile__  (
"	zdep	%3,28,2,%%r19\n"		/* r19=(ofs&3)*8 */
"	mtsp	%4, %%sr1\n"
"	depw	%%r0,31,2,%3\n"
"1:	ldw	0(%%sr1,%3),%0\n"
"2:	ldw	4(%%sr1,%3),%%r20\n"
"	subi	32,%%r19,%%r19\n"
"	mtctl	%%r19,11\n"
"	vshd	%0,%%r20,%0\n"
"	copy	%%r0, %1\n"
"3:	\n"
"	.section .fixup,\"ax\"\n"
"4:	ldi	-2, %1\n"
	FIXUP_BRANCH(3b)
"	.previous\n"
	ASM_EXCEPTIONTABLE_ENTRY(1b, 4b)
	ASM_EXCEPTIONTABLE_ENTRY(2b, 4b)
	: "=r" (val), "=r" (ret)
	: "0" (val), "r" (saddr), "r" (regs->isr)
	: "r19", "r20", FIXUP_BRANCH_CLOBBER );

	DPRINTF("val = 0x" RFMT "\n", val);

	if (flop)
		((__u32*)(regs->fr))[toreg] = val;
	else if (toreg)
		regs->gr[toreg] = val;

	return ret;
}
static int emulate_ldd(struct pt_regs *regs, int toreg, int flop)
{
	unsigned long saddr = regs->ior;
	__u64 val = 0;
	int ret;

	DPRINTF("load " RFMT ":" RFMT " to r%d for 8 bytes\n", 
		regs->isr, regs->ior, toreg);
#ifdef CONFIG_PA20

#ifndef CONFIG_64BIT
	if (!flop)
		return -1;
#endif
	__asm__ __volatile__  (
"	depd,z	%3,60,3,%%r19\n"		/* r19=(ofs&7)*8 */
"	mtsp	%4, %%sr1\n"
"	depd	%%r0,63,3,%3\n"
"1:	ldd	0(%%sr1,%3),%0\n"
"2:	ldd	8(%%sr1,%3),%%r20\n"
"	subi	64,%%r19,%%r19\n"
"	mtsar	%%r19\n"
"	shrpd	%0,%%r20,%%sar,%0\n"
"	copy	%%r0, %1\n"
"3:	\n"
"	.section .fixup,\"ax\"\n"
"4:	ldi	-2, %1\n"
	FIXUP_BRANCH(3b)
"	.previous\n"
	ASM_EXCEPTIONTABLE_ENTRY(1b,4b)
	ASM_EXCEPTIONTABLE_ENTRY(2b,4b)
	: "=r" (val), "=r" (ret)
	: "0" (val), "r" (saddr), "r" (regs->isr)
	: "r19", "r20", FIXUP_BRANCH_CLOBBER );
#else
    {
	unsigned long valh=0,vall=0;
	__asm__ __volatile__  (
"	zdep	%5,29,2,%%r19\n"		/* r19=(ofs&3)*8 */
"	mtsp	%6, %%sr1\n"
"	dep	%%r0,31,2,%5\n"
"1:	ldw	0(%%sr1,%5),%0\n"
"2:	ldw	4(%%sr1,%5),%1\n"
"3:	ldw	8(%%sr1,%5),%%r20\n"
"	subi	32,%%r19,%%r19\n"
"	mtsar	%%r19\n"
"	vshd	%0,%1,%0\n"
"	vshd	%1,%%r20,%1\n"
"	copy	%%r0, %2\n"
"4:	\n"
"	.section .fixup,\"ax\"\n"
"5:	ldi	-2, %2\n"
	FIXUP_BRANCH(4b)
"	.previous\n"
	ASM_EXCEPTIONTABLE_ENTRY(1b,5b)
	ASM_EXCEPTIONTABLE_ENTRY(2b,5b)
	ASM_EXCEPTIONTABLE_ENTRY(3b,5b)
	: "=r" (valh), "=r" (vall), "=r" (ret)
	: "0" (valh), "1" (vall), "r" (saddr), "r" (regs->isr)
	: "r19", "r20", FIXUP_BRANCH_CLOBBER );
	val=((__u64)valh<<32)|(__u64)vall;
    }
#endif

	DPRINTF("val = 0x%llx\n", val);

	if (flop)
		regs->fr[toreg] = val;
	else if (toreg)
		regs->gr[toreg] = val;

	return ret;
}

static int emulate_sth(struct pt_regs *regs, int frreg)
{
	unsigned long val = regs->gr[frreg];
	int ret;

	if (!frreg)
		val = 0;

	DPRINTF("store r%d (0x" RFMT ") to " RFMT ":" RFMT " for 2 bytes\n", frreg, 
		val, regs->isr, regs->ior);

	__asm__ __volatile__ (
"	mtsp %3, %%sr1\n"
"	extrw,u %1, 23, 8, %%r19\n"
"1:	stb %1, 1(%%sr1, %2)\n"
"2:	stb %%r19, 0(%%sr1, %2)\n"
"	copy	%%r0, %0\n"
"3:	\n"
"	.section .fixup,\"ax\"\n"
"4:	ldi	-2, %0\n"
	FIXUP_BRANCH(3b)
"	.previous\n"
	ASM_EXCEPTIONTABLE_ENTRY(1b,4b)
	ASM_EXCEPTIONTABLE_ENTRY(2b,4b)
	: "=r" (ret)
	: "r" (val), "r" (regs->ior), "r" (regs->isr)
	: "r19", FIXUP_BRANCH_CLOBBER );

	return ret;
}

static int emulate_stw(struct pt_regs *regs, int frreg, int flop)
{
	unsigned long val;
	int ret;

	if (flop)
		val = ((__u32*)(regs->fr))[frreg];
	else if (frreg)
		val = regs->gr[frreg];
	else
		val = 0;

	DPRINTF("store r%d (0x" RFMT ") to " RFMT ":" RFMT " for 4 bytes\n", frreg, 
		val, regs->isr, regs->ior);


	__asm__ __volatile__ (
"	mtsp %3, %%sr1\n"
"	zdep	%2, 28, 2, %%r19\n"
"	dep	%%r0, 31, 2, %2\n"
"	mtsar	%%r19\n"
"	depwi,z	-2, %%sar, 32, %%r19\n"
"1:	ldw	0(%%sr1,%2),%%r20\n"
"2:	ldw	4(%%sr1,%2),%%r21\n"
"	vshd	%%r0, %1, %%r22\n"
"	vshd	%1, %%r0, %%r1\n"
"	and	%%r20, %%r19, %%r20\n"
"	andcm	%%r21, %%r19, %%r21\n"
"	or	%%r22, %%r20, %%r20\n"
"	or	%%r1, %%r21, %%r21\n"
"	stw	%%r20,0(%%sr1,%2)\n"
"	stw	%%r21,4(%%sr1,%2)\n"
"	copy	%%r0, %0\n"
"3:	\n"
"	.section .fixup,\"ax\"\n"
"4:	ldi	-2, %0\n"
	FIXUP_BRANCH(3b)
"	.previous\n"
	ASM_EXCEPTIONTABLE_ENTRY(1b,4b)
	ASM_EXCEPTIONTABLE_ENTRY(2b,4b)
	: "=r" (ret)
	: "r" (val), "r" (regs->ior), "r" (regs->isr)
	: "r19", "r20", "r21", "r22", "r1", FIXUP_BRANCH_CLOBBER );

	return 0;
}
static int emulate_std(struct pt_regs *regs, int frreg, int flop)
{
	__u64 val;
	int ret;

	if (flop)
		val = regs->fr[frreg];
	else if (frreg)
		val = regs->gr[frreg];
	else
		val = 0;

	DPRINTF("store r%d (0x%016llx) to " RFMT ":" RFMT " for 8 bytes\n", frreg, 
		val,  regs->isr, regs->ior);

#ifdef CONFIG_PA20
#ifndef CONFIG_64BIT
	if (!flop)
		return -1;
#endif
	__asm__ __volatile__ (
"	mtsp %3, %%sr1\n"
"	depd,z	%2, 60, 3, %%r19\n"
"	depd	%%r0, 63, 3, %2\n"
"	mtsar	%%r19\n"
"	depdi,z	-2, %%sar, 64, %%r19\n"
"1:	ldd	0(%%sr1,%2),%%r20\n"
"2:	ldd	8(%%sr1,%2),%%r21\n"
"	shrpd	%%r0, %1, %%sar, %%r22\n"
"	shrpd	%1, %%r0, %%sar, %%r1\n"
"	and	%%r20, %%r19, %%r20\n"
"	andcm	%%r21, %%r19, %%r21\n"
"	or	%%r22, %%r20, %%r20\n"
"	or	%%r1, %%r21, %%r21\n"
"3:	std	%%r20,0(%%sr1,%2)\n"
"4:	std	%%r21,8(%%sr1,%2)\n"
"	copy	%%r0, %0\n"
"5:	\n"
"	.section .fixup,\"ax\"\n"
"6:	ldi	-2, %0\n"
	FIXUP_BRANCH(5b)
"	.previous\n"
	ASM_EXCEPTIONTABLE_ENTRY(1b,6b)
	ASM_EXCEPTIONTABLE_ENTRY(2b,6b)
	ASM_EXCEPTIONTABLE_ENTRY(3b,6b)
	ASM_EXCEPTIONTABLE_ENTRY(4b,6b)
	: "=r" (ret)
	: "r" (val), "r" (regs->ior), "r" (regs->isr)
	: "r19", "r20", "r21", "r22", "r1", FIXUP_BRANCH_CLOBBER );
#else
    {
	unsigned long valh=(val>>32),vall=(val&0xffffffffl);
	__asm__ __volatile__ (
"	mtsp	%4, %%sr1\n"
"	zdep	%2, 29, 2, %%r19\n"
"	dep	%%r0, 31, 2, %2\n"
"	mtsar	%%r19\n"
"	zvdepi	-2, 32, %%r19\n"
"1:	ldw	0(%%sr1,%3),%%r20\n"
"2:	ldw	8(%%sr1,%3),%%r21\n"
"	vshd	%1, %2, %%r1\n"
"	vshd	%%r0, %1, %1\n"
"	vshd	%2, %%r0, %2\n"
"	and	%%r20, %%r19, %%r20\n"
"	andcm	%%r21, %%r19, %%r21\n"
"	or	%1, %%r20, %1\n"
"	or	%2, %%r21, %2\n"
"3:	stw	%1,0(%%sr1,%1)\n"
"4:	stw	%%r1,4(%%sr1,%3)\n"
"5:	stw	%2,8(%%sr1,%3)\n"
"	copy	%%r0, %0\n"
"6:	\n"
"	.section .fixup,\"ax\"\n"
"7:	ldi	-2, %0\n"
	FIXUP_BRANCH(6b)
"	.previous\n"
	ASM_EXCEPTIONTABLE_ENTRY(1b,7b)
	ASM_EXCEPTIONTABLE_ENTRY(2b,7b)
	ASM_EXCEPTIONTABLE_ENTRY(3b,7b)
	ASM_EXCEPTIONTABLE_ENTRY(4b,7b)
	ASM_EXCEPTIONTABLE_ENTRY(5b,7b)
	: "=r" (ret)
	: "r" (valh), "r" (vall), "r" (regs->ior), "r" (regs->isr)
	: "r19", "r20", "r21", "r1", FIXUP_BRANCH_CLOBBER );
    }
#endif

	return ret;
}

void handle_unaligned(struct pt_regs *regs)
{
	static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5);
	unsigned long newbase = R1(regs->iir)?regs->gr[R1(regs->iir)]:0;
	int modify = 0;
	int ret = ERR_NOTHANDLED;
	register int flop=0;	/* true if this is a flop */

	__inc_irq_stat(irq_unaligned_count);

	/* log a message with pacing */
	if (user_mode(regs)) {
		if (current->thread.flags & PARISC_UAC_SIGBUS) {
			goto force_sigbus;
		}

		if (!(current->thread.flags & PARISC_UAC_NOPRINT) &&
			__ratelimit(&ratelimit)) {
			char buf[256];
			sprintf(buf, "%s(%d): unaligned access to 0x" RFMT " at ip=0x" RFMT "\n",
				current->comm, task_pid_nr(current), regs->ior, regs->iaoq[0]);
			printk(KERN_WARNING "%s", buf);
#ifdef DEBUG_UNALIGNED
			show_regs(regs);
#endif		
		}

		if (!unaligned_enabled)
			goto force_sigbus;
	}

	/* handle modification - OK, it's ugly, see the instruction manual */
	switch (MAJOR_OP(regs->iir))
	{
	case 0x03:
	case 0x09:
	case 0x0b:
		if (regs->iir&0x20)
		{
			modify = 1;
			if (regs->iir&0x1000)		/* short loads */
				if (regs->iir&0x200)
					newbase += IM5_3(regs->iir);
				else
					newbase += IM5_2(regs->iir);
			else if (regs->iir&0x2000)	/* scaled indexed */
			{
				int shift=0;
				switch (regs->iir & OPCODE1_MASK)
				{
				case OPCODE_LDH_I:
					shift= 1; break;
				case OPCODE_LDW_I:
					shift= 2; break;
				case OPCODE_LDD_I:
				case OPCODE_LDDA_I:
					shift= 3; break;
				}
				newbase += (R2(regs->iir)?regs->gr[R2(regs->iir)]:0)<<shift;
			} else				/* simple indexed */
				newbase += (R2(regs->iir)?regs->gr[R2(regs->iir)]:0);
		}
		break;
	case 0x13:
	case 0x1b:
		modify = 1;
		newbase += IM14(regs->iir);
		break;
	case 0x14:
	case 0x1c:
		if (regs->iir&8)
		{
			modify = 1;
			newbase += IM14(regs->iir&~0xe);
		}
		break;
	case 0x16:
	case 0x1e:
		modify = 1;
		newbase += IM14(regs->iir&6);
		break;
	case 0x17:
	case 0x1f:
		if (regs->iir&4)
		{
			modify = 1;
			newbase += IM14(regs->iir&~4);
		}
		break;
	}

	/* TODO: make this cleaner... */
	switch (regs->iir & OPCODE1_MASK)
	{
	case OPCODE_LDH_I:
	case OPCODE_LDH_S:
		ret = emulate_ldh(regs, R3(regs->iir));
		break;

	case OPCODE_LDW_I:
	case OPCODE_LDWA_I:
	case OPCODE_LDW_S:
	case OPCODE_LDWA_S:
		ret = emulate_ldw(regs, R3(regs->iir),0);
		break;

	case OPCODE_STH:
		ret = emulate_sth(regs, R2(regs->iir));
		break;

	case OPCODE_STW:
	case OPCODE_STWA:
		ret = emulate_stw(regs, R2(regs->iir),0);
		break;

#ifdef CONFIG_PA20
	case OPCODE_LDD_I:
	case OPCODE_LDDA_I:
	case OPCODE_LDD_S:
	case OPCODE_LDDA_S:
		ret = emulate_ldd(regs, R3(regs->iir),0);
		break;

	case OPCODE_STD:
	case OPCODE_STDA:
		ret = emulate_std(regs, R2(regs->iir),0);
		break;
#endif

	case OPCODE_FLDWX:
	case OPCODE_FLDWS:
	case OPCODE_FLDWXR:
	case OPCODE_FLDWSR:
		flop=1;
		ret = emulate_ldw(regs,FR3(regs->iir),1);
		break;

	case OPCODE_FLDDX:
	case OPCODE_FLDDS:
		flop=1;
		ret = emulate_ldd(regs,R3(regs->iir),1);
		break;

	case OPCODE_FSTWX:
	case OPCODE_FSTWS:
	case OPCODE_FSTWXR:
	case OPCODE_FSTWSR:
		flop=1;
		ret = emulate_stw(regs,FR3(regs->iir),1);
		break;

	case OPCODE_FSTDX:
	case OPCODE_FSTDS:
		flop=1;
		ret = emulate_std(regs,R3(regs->iir),1);
		break;

	case OPCODE_LDCD_I:
	case OPCODE_LDCW_I:
	case OPCODE_LDCD_S:
	case OPCODE_LDCW_S:
		ret = ERR_NOTHANDLED;	/* "undefined", but lets kill them. */
		break;
	}
#ifdef CONFIG_PA20
	switch (regs->iir & OPCODE2_MASK)
	{
	case OPCODE_FLDD_L:
		flop=1;
		ret = emulate_ldd(regs,R2(regs->iir),1);
		break;
	case OPCODE_FSTD_L:
		flop=1;
		ret = emulate_std(regs, R2(regs->iir),1);
		break;
	case OPCODE_LDD_L:
		ret = emulate_ldd(regs, R2(regs->iir),0);
		break;
	case OPCODE_STD_L:
		ret = emulate_std(regs, R2(regs->iir),0);
		break;
	}
#endif
	switch (regs->iir & OPCODE3_MASK)
	{
	case OPCODE_FLDW_L:
		flop=1;
		ret = emulate_ldw(regs, R2(regs->iir),0);
		break;
	case OPCODE_LDW_M:
		ret = emulate_ldw(regs, R2(regs->iir),1);
		break;

	case OPCODE_FSTW_L:
		flop=1;
		ret = emulate_stw(regs, R2(regs->iir),1);
		break;
	case OPCODE_STW_M:
		ret = emulate_stw(regs, R2(regs->iir),0);
		break;
	}
	switch (regs->iir & OPCODE4_MASK)
	{
	case OPCODE_LDH_L:
		ret = emulate_ldh(regs, R2(regs->iir));
		break;
	case OPCODE_LDW_L:
	case OPCODE_LDWM:
		ret = emulate_ldw(regs, R2(regs->iir),0);
		break;
	case OPCODE_STH_L:
		ret = emulate_sth(regs, R2(regs->iir));
		break;
	case OPCODE_STW_L:
	case OPCODE_STWM:
		ret = emulate_stw(regs, R2(regs->iir),0);
		break;
	}

	if (ret == 0 && modify && R1(regs->iir))
		regs->gr[R1(regs->iir)] = newbase;


	if (ret == ERR_NOTHANDLED)
		printk(KERN_CRIT "Not-handled unaligned insn 0x%08lx\n", regs->iir);

	DPRINTF("ret = %d\n", ret);

	if (ret)
	{
		/*
		 * The unaligned handler failed.
		 * If we were called by __get_user() or __put_user() jump
		 * to it's exception fixup handler instead of crashing.
		 */
		if (!user_mode(regs) && fixup_exception(regs))
			return;

		printk(KERN_CRIT "Unaligned handler failed, ret = %d\n", ret);
		die_if_kernel("Unaligned data reference", regs, 28);

		if (ret == ERR_PAGEFAULT)
		{
			force_sig_fault(SIGSEGV, SEGV_MAPERR,
					(void __user *)regs->ior, current);
		}
		else
		{
force_sigbus:
			/* couldn't handle it ... */
			force_sig_fault(SIGBUS, BUS_ADRALN,
					(void __user *)regs->ior, current);
		}
		
		return;
	}

	/* else we handled it, let life go on. */
	regs->gr[0]|=PSW_N;
}

/*
 * NB: check_unaligned() is only used for PCXS processors right
 * now, so we only check for PA1.1 encodings at this point.
 */

int
check_unaligned(struct pt_regs *regs)
{
	unsigned long align_mask;

	/* Get alignment mask */

	align_mask = 0UL;
	switch (regs->iir & OPCODE1_MASK) {

	case OPCODE_LDH_I:
	case OPCODE_LDH_S:
	case OPCODE_STH:
		align_mask = 1UL;
		break;

	case OPCODE_LDW_I:
	case OPCODE_LDWA_I:
	case OPCODE_LDW_S:
	case OPCODE_LDWA_S:
	case OPCODE_STW:
	case OPCODE_STWA:
		align_mask = 3UL;
		break;

	default:
		switch (regs->iir & OPCODE4_MASK) {
		case OPCODE_LDH_L:
		case OPCODE_STH_L:
			align_mask = 1UL;
			break;
		case OPCODE_LDW_L:
		case OPCODE_LDWM:
		case OPCODE_STW_L:
		case OPCODE_STWM:
			align_mask = 3UL;
			break;
		}
		break;
	}

	return (int)(regs->ior & align_mask);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Unaligned memory access handler
	3	*
	4	* Copyright (C) 2001 Randolph Chung <tausq@debian.org>
	5	* Significantly tweaked by LaMont Jones <lamont@debian.org>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2, or (at your option)
	10	* any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	*
	21	*/
	22
e6fc0449	23	#include <linux/jiffies.h>
1da177e4 LT	24	#include <linux/kernel.h>
1da177e4 LT	25	#include <linux/module.h>
3f07c014	26	#include <linux/sched/signal.h>
b17b0153	27	#include <linux/sched/debug.h>
e6fc0449	28	#include <linux/signal.h>
6ee77658	29	#include <linux/ratelimit.h>
7c0f6ba6	30	#include <linux/uaccess.h>
d0c3be80	31	#include <asm/hardirq.h>
58f1c654	32	#include <asm/traps.h>
1da177e4 LT	33
	34	/* #define DEBUG_UNALIGNED 1 */
	35
	36	#ifdef DEBUG_UNALIGNED
91bae23c	37	#define DPRINTF(fmt, args...) do { printk(KERN_DEBUG "%s:%d:%s ", __FILE__, __LINE__, __func__ ); printk(KERN_DEBUG fmt, ##args ); } while (0)
1da177e4 LT	38	#else
	39	#define DPRINTF(fmt, args...)
	40	#endif
	41
0b3d643f	42	#ifdef CONFIG_64BIT
1da177e4 LT	43	#define RFMT "%016lx"
	44	#else
	45	#define RFMT "%08lx"
	46	#endif
	47
	48	#define FIXUP_BRANCH(lbl) \
	49	"\tldil L%%" #lbl ", %%r1\n" \
	50	"\tldo R%%" #lbl "(%%r1), %%r1\n" \
	51	"\tbv,n %%r0(%%r1)\n"
3fd3a74f CD	52	/* If you use FIXUP_BRANCH, then you must list this clobber */
3fd3a74f CD	53	#define FIXUP_BRANCH_CLOBBER "r1"
1da177e4 LT	54
	55	/* 1111 1100 0000 0000 0001 0011 1100 0000 */
	56	#define OPCODE1(a,b,c) ((a)<<26\|(b)<<12\|(c)<<6)
	57	#define OPCODE2(a,b) ((a)<<26\|(b)<<1)
	58	#define OPCODE3(a,b) ((a)<<26\|(b)<<2)
	59	#define OPCODE4(a) ((a)<<26)
	60	#define OPCODE1_MASK OPCODE1(0x3f,1,0xf)
	61	#define OPCODE2_MASK OPCODE2(0x3f,1)
	62	#define OPCODE3_MASK OPCODE3(0x3f,1)
	63	#define OPCODE4_MASK OPCODE4(0x3f)
	64
	65	/* skip LDB - never unaligned (index) */
	66	#define OPCODE_LDH_I OPCODE1(0x03,0,0x1)
	67	#define OPCODE_LDW_I OPCODE1(0x03,0,0x2)
	68	#define OPCODE_LDD_I OPCODE1(0x03,0,0x3)
	69	#define OPCODE_LDDA_I OPCODE1(0x03,0,0x4)
	70	#define OPCODE_LDCD_I OPCODE1(0x03,0,0x5)
	71	#define OPCODE_LDWA_I OPCODE1(0x03,0,0x6)
	72	#define OPCODE_LDCW_I OPCODE1(0x03,0,0x7)
	73	/* skip LDB - never unaligned (short) */
	74	#define OPCODE_LDH_S OPCODE1(0x03,1,0x1)
	75	#define OPCODE_LDW_S OPCODE1(0x03,1,0x2)
	76	#define OPCODE_LDD_S OPCODE1(0x03,1,0x3)
	77	#define OPCODE_LDDA_S OPCODE1(0x03,1,0x4)
	78	#define OPCODE_LDCD_S OPCODE1(0x03,1,0x5)
	79	#define OPCODE_LDWA_S OPCODE1(0x03,1,0x6)
	80	#define OPCODE_LDCW_S OPCODE1(0x03,1,0x7)
	81	/* skip STB - never unaligned */
	82	#define OPCODE_STH OPCODE1(0x03,1,0x9)
	83	#define OPCODE_STW OPCODE1(0x03,1,0xa)
	84	#define OPCODE_STD OPCODE1(0x03,1,0xb)
	85	/* skip STBY - never unaligned */
	86	/* skip STDBY - never unaligned */
	87	#define OPCODE_STWA OPCODE1(0x03,1,0xe)
	88	#define OPCODE_STDA OPCODE1(0x03,1,0xf)
	89
	90	#define OPCODE_FLDWX OPCODE1(0x09,0,0x0)
	91	#define OPCODE_FLDWXR OPCODE1(0x09,0,0x1)
	92	#define OPCODE_FSTWX OPCODE1(0x09,0,0x8)
	93	#define OPCODE_FSTWXR OPCODE1(0x09,0,0x9)
	94	#define OPCODE_FLDWS OPCODE1(0x09,1,0x0)
	95	#define OPCODE_FLDWSR OPCODE1(0x09,1,0x1)
	96	#define OPCODE_FSTWS OPCODE1(0x09,1,0x8)
	97	#define OPCODE_FSTWSR OPCODE1(0x09,1,0x9)
	98	#define OPCODE_FLDDX OPCODE1(0x0b,0,0x0)
	99	#define OPCODE_FSTDX OPCODE1(0x0b,0,0x8)
	100	#define OPCODE_FLDDS OPCODE1(0x0b,1,0x0)
	101	#define OPCODE_FSTDS OPCODE1(0x0b,1,0x8)
	102
	103	#define OPCODE_LDD_L OPCODE2(0x14,0)
	104	#define OPCODE_FLDD_L OPCODE2(0x14,1)
	105	#define OPCODE_STD_L OPCODE2(0x1c,0)
	106	#define OPCODE_FSTD_L OPCODE2(0x1c,1)
	107
	108	#define OPCODE_LDW_M OPCODE3(0x17,1)
	109	#define OPCODE_FLDW_L OPCODE3(0x17,0)
	110	#define OPCODE_FSTW_L OPCODE3(0x1f,0)
	111	#define OPCODE_STW_M OPCODE3(0x1f,1)
	112
	113	#define OPCODE_LDH_L OPCODE4(0x11)
	114	#define OPCODE_LDW_L OPCODE4(0x12)
	115	#define OPCODE_LDWM OPCODE4(0x13)
	116	#define OPCODE_STH_L OPCODE4(0x19)
	117	#define OPCODE_STW_L OPCODE4(0x1A)
118	#define OPCODE_STWM OPCODE4(0x1B)
119
120	#define MAJOR_OP(i) (((i)>>26)&0x3f)
121	#define R1(i) (((i)>>21)&0x1f)
122	#define R2(i) (((i)>>16)&0x1f)
123	#define R3(i) ((i)&0x1f)
124	#define FR3(i) ((((i)<<1)&0x1f)\|(((i)>>6)&1))
125	#define IM(i,n) (((i)>>1&((1<<(n-1))-1))\|((i)&1?((0-1L)<<(n-1)):0))
126	#define IM5_2(i) IM((i)>>16,5)
127	#define IM5_3(i) IM((i),5)
128	#define IM14(i) IM((i),14)
129
130	#define ERR_NOTHANDLED -1
131	#define ERR_PAGEFAULT -2
132
8039de10	133	int unaligned_enabled __read_mostly = 1;
1da177e4	134
1da177e4 LT	135	static int emulate_ldh(struct pt_regs *regs, int toreg)
	136	{
	137	unsigned long saddr = regs->ior;
	138	unsigned long val = 0;
	139	int ret;
	140
	141	DPRINTF("load " RFMT ":" RFMT " to r%d for 2 bytes\n",
	142	regs->isr, regs->ior, toreg);
	143
	144	__asm__ __volatile__ (
	145	" mtsp %4, %%sr1\n"
	146	"1: ldbs 0(%%sr1,%3), %%r20\n"
	147	"2: ldbs 1(%%sr1,%3), %0\n"
	148	" depw %%r20, 23, 24, %0\n"
	149	" copy %%r0, %1\n"
	150	"3: \n"
	151	" .section .fixup,\"ax\"\n"
	152	"4: ldi -2, %1\n"
	153	FIXUP_BRANCH(3b)
	154	" .previous\n"
0b3d643f HD	155	ASM_EXCEPTIONTABLE_ENTRY(1b, 4b)
0b3d643f HD	156	ASM_EXCEPTIONTABLE_ENTRY(2b, 4b)
1da177e4 LT	157	: "=r" (val), "=r" (ret)
1da177e4 LT	158	: "0" (val), "r" (saddr), "r" (regs->isr)
3fd3a74f	159	: "r20", FIXUP_BRANCH_CLOBBER );
1da177e4 LT	160
	161	DPRINTF("val = 0x" RFMT "\n", val);
	162
	163	if (toreg)
	164	regs->gr[toreg] = val;
	165
	166	return ret;
	167	}
	168
	169	static int emulate_ldw(struct pt_regs *regs, int toreg, int flop)
	170	{
	171	unsigned long saddr = regs->ior;
	172	unsigned long val = 0;
	173	int ret;
	174
	175	DPRINTF("load " RFMT ":" RFMT " to r%d for 4 bytes\n",
	176	regs->isr, regs->ior, toreg);
	177
	178	__asm__ __volatile__ (
	179	" zdep %3,28,2,%%r19\n" /* r19=(ofs&3)8 /
	180	" mtsp %4, %%sr1\n"
	181	" depw %%r0,31,2,%3\n"
	182	"1: ldw 0(%%sr1,%3),%0\n"
	183	"2: ldw 4(%%sr1,%3),%%r20\n"
	184	" subi 32,%%r19,%%r19\n"
	185	" mtctl %%r19,11\n"
	186	" vshd %0,%%r20,%0\n"
	187	" copy %%r0, %1\n"
	188	"3: \n"
	189	" .section .fixup,\"ax\"\n"
	190	"4: ldi -2, %1\n"
	191	FIXUP_BRANCH(3b)
	192	" .previous\n"
0b3d643f HD	193	ASM_EXCEPTIONTABLE_ENTRY(1b, 4b)
0b3d643f HD	194	ASM_EXCEPTIONTABLE_ENTRY(2b, 4b)
1da177e4 LT	195	: "=r" (val), "=r" (ret)
1da177e4 LT	196	: "0" (val), "r" (saddr), "r" (regs->isr)
3fd3a74f	197	: "r19", "r20", FIXUP_BRANCH_CLOBBER );
1da177e4 LT	198
	199	DPRINTF("val = 0x" RFMT "\n", val);
	200
	201	if (flop)
	202	((__u32*)(regs->fr))[toreg] = val;
	203	else if (toreg)
	204	regs->gr[toreg] = val;
	205
	206	return ret;
	207	}
	208	static int emulate_ldd(struct pt_regs *regs, int toreg, int flop)
	209	{
	210	unsigned long saddr = regs->ior;
	211	__u64 val = 0;
	212	int ret;
	213
	214	DPRINTF("load " RFMT ":" RFMT " to r%d for 8 bytes\n",
	215	regs->isr, regs->ior, toreg);
	216	#ifdef CONFIG_PA20
	217
0b3d643f	218	#ifndef CONFIG_64BIT
1da177e4 LT	219	if (!flop)
	220	return -1;
	221	#endif
	222	__asm__ __volatile__ (
	223	" depd,z %3,60,3,%%r19\n" /* r19=(ofs&7)8 /
	224	" mtsp %4, %%sr1\n"
	225	" depd %%r0,63,3,%3\n"
	226	"1: ldd 0(%%sr1,%3),%0\n"
	227	"2: ldd 8(%%sr1,%3),%%r20\n"
	228	" subi 64,%%r19,%%r19\n"
	229	" mtsar %%r19\n"
	230	" shrpd %0,%%r20,%%sar,%0\n"
	231	" copy %%r0, %1\n"
	232	"3: \n"
	233	" .section .fixup,\"ax\"\n"
	234	"4: ldi -2, %1\n"
	235	FIXUP_BRANCH(3b)
	236	" .previous\n"
0b3d643f HD	237	ASM_EXCEPTIONTABLE_ENTRY(1b,4b)
0b3d643f HD	238	ASM_EXCEPTIONTABLE_ENTRY(2b,4b)
1da177e4 LT	239	: "=r" (val), "=r" (ret)
1da177e4 LT	240	: "0" (val), "r" (saddr), "r" (regs->isr)
3fd3a74f	241	: "r19", "r20", FIXUP_BRANCH_CLOBBER );
1da177e4 LT	242	#else
	243	{
	244	unsigned long valh=0,vall=0;
	245	__asm__ __volatile__ (
	246	" zdep %5,29,2,%%r19\n" /* r19=(ofs&3)8 /
	247	" mtsp %6, %%sr1\n"
	248	" dep %%r0,31,2,%5\n"
	249	"1: ldw 0(%%sr1,%5),%0\n"
	250	"2: ldw 4(%%sr1,%5),%1\n"
	251	"3: ldw 8(%%sr1,%5),%%r20\n"
	252	" subi 32,%%r19,%%r19\n"
	253	" mtsar %%r19\n"
	254	" vshd %0,%1,%0\n"
	255	" vshd %1,%%r20,%1\n"
	256	" copy %%r0, %2\n"
	257	"4: \n"
	258	" .section .fixup,\"ax\"\n"
	259	"5: ldi -2, %2\n"
	260	FIXUP_BRANCH(4b)
	261	" .previous\n"
0b3d643f HD	262	ASM_EXCEPTIONTABLE_ENTRY(1b,5b)
	263	ASM_EXCEPTIONTABLE_ENTRY(2b,5b)
	264	ASM_EXCEPTIONTABLE_ENTRY(3b,5b)
1da177e4 LT	265	: "=r" (valh), "=r" (vall), "=r" (ret)
1da177e4 LT	266	: "0" (valh), "1" (vall), "r" (saddr), "r" (regs->isr)
3fd3a74f	267	: "r19", "r20", FIXUP_BRANCH_CLOBBER );
1da177e4 LT	268	val=((__u64)valh<<32)\|(__u64)vall;
	269	}
	270	#endif
	271
	272	DPRINTF("val = 0x%llx\n", val);
	273
	274	if (flop)
	275	regs->fr[toreg] = val;
	276	else if (toreg)
	277	regs->gr[toreg] = val;
	278
	279	return ret;
	280	}
	281
	282	static int emulate_sth(struct pt_regs *regs, int frreg)
	283	{
	284	unsigned long val = regs->gr[frreg];
	285	int ret;
	286
	287	if (!frreg)
	288	val = 0;
	289
	290	DPRINTF("store r%d (0x" RFMT ") to " RFMT ":" RFMT " for 2 bytes\n", frreg,
	291	val, regs->isr, regs->ior);
	292
	293	__asm__ __volatile__ (
	294	" mtsp %3, %%sr1\n"
	295	" extrw,u %1, 23, 8, %%r19\n"
	296	"1: stb %1, 1(%%sr1, %2)\n"
	297	"2: stb %%r19, 0(%%sr1, %2)\n"
	298	" copy %%r0, %0\n"
	299	"3: \n"
	300	" .section .fixup,\"ax\"\n"
	301	"4: ldi -2, %0\n"
	302	FIXUP_BRANCH(3b)
	303	" .previous\n"
0b3d643f HD	304	ASM_EXCEPTIONTABLE_ENTRY(1b,4b)
0b3d643f HD	305	ASM_EXCEPTIONTABLE_ENTRY(2b,4b)
1da177e4 LT	306	: "=r" (ret)
1da177e4 LT	307	: "r" (val), "r" (regs->ior), "r" (regs->isr)
3fd3a74f	308	: "r19", FIXUP_BRANCH_CLOBBER );
1da177e4 LT	309
	310	return ret;
	311	}
	312
	313	static int emulate_stw(struct pt_regs *regs, int frreg, int flop)
	314	{
	315	unsigned long val;
	316	int ret;
	317
	318	if (flop)
	319	val = ((__u32*)(regs->fr))[frreg];
	320	else if (frreg)
	321	val = regs->gr[frreg];
	322	else
	323	val = 0;
	324
	325	DPRINTF("store r%d (0x" RFMT ") to " RFMT ":" RFMT " for 4 bytes\n", frreg,
	326	val, regs->isr, regs->ior);
	327
	328
	329	__asm__ __volatile__ (
	330	" mtsp %3, %%sr1\n"
	331	" zdep %2, 28, 2, %%r19\n"
	332	" dep %%r0, 31, 2, %2\n"
	333	" mtsar %%r19\n"
	334	" depwi,z -2, %%sar, 32, %%r19\n"
	335	"1: ldw 0(%%sr1,%2),%%r20\n"
	336	"2: ldw 4(%%sr1,%2),%%r21\n"
	337	" vshd %%r0, %1, %%r22\n"
	338	" vshd %1, %%r0, %%r1\n"
	339	" and %%r20, %%r19, %%r20\n"
	340	" andcm %%r21, %%r19, %%r21\n"
	341	" or %%r22, %%r20, %%r20\n"
	342	" or %%r1, %%r21, %%r21\n"
	343	" stw %%r20,0(%%sr1,%2)\n"
	344	" stw %%r21,4(%%sr1,%2)\n"
	345	" copy %%r0, %0\n"
	346	"3: \n"
	347	" .section .fixup,\"ax\"\n"
	348	"4: ldi -2, %0\n"
	349	FIXUP_BRANCH(3b)
	350	" .previous\n"
0b3d643f HD	351	ASM_EXCEPTIONTABLE_ENTRY(1b,4b)
0b3d643f HD	352	ASM_EXCEPTIONTABLE_ENTRY(2b,4b)
1da177e4 LT	353	: "=r" (ret)
1da177e4 LT	354	: "r" (val), "r" (regs->ior), "r" (regs->isr)
3fd3a74f	355	: "r19", "r20", "r21", "r22", "r1", FIXUP_BRANCH_CLOBBER );
1da177e4 LT	356
	357	return 0;
	358	}
	359	static int emulate_std(struct pt_regs *regs, int frreg, int flop)
	360	{
	361	__u64 val;
	362	int ret;
	363
	364	if (flop)
	365	val = regs->fr[frreg];
	366	else if (frreg)
	367	val = regs->gr[frreg];
	368	else
	369	val = 0;
	370
	371	DPRINTF("store r%d (0x%016llx) to " RFMT ":" RFMT " for 8 bytes\n", frreg,
	372	val, regs->isr, regs->ior);
	373
	374	#ifdef CONFIG_PA20
0b3d643f	375	#ifndef CONFIG_64BIT
1da177e4 LT	376	if (!flop)
	377	return -1;
	378	#endif
	379	__asm__ __volatile__ (
	380	" mtsp %3, %%sr1\n"
	381	" depd,z %2, 60, 3, %%r19\n"
	382	" depd %%r0, 63, 3, %2\n"
	383	" mtsar %%r19\n"
	384	" depdi,z -2, %%sar, 64, %%r19\n"
	385	"1: ldd 0(%%sr1,%2),%%r20\n"
	386	"2: ldd 8(%%sr1,%2),%%r21\n"
	387	" shrpd %%r0, %1, %%sar, %%r22\n"
	388	" shrpd %1, %%r0, %%sar, %%r1\n"
	389	" and %%r20, %%r19, %%r20\n"
	390	" andcm %%r21, %%r19, %%r21\n"
	391	" or %%r22, %%r20, %%r20\n"
	392	" or %%r1, %%r21, %%r21\n"
	393	"3: std %%r20,0(%%sr1,%2)\n"
	394	"4: std %%r21,8(%%sr1,%2)\n"
	395	" copy %%r0, %0\n"
	396	"5: \n"
	397	" .section .fixup,\"ax\"\n"
	398	"6: ldi -2, %0\n"
	399	FIXUP_BRANCH(5b)
	400	" .previous\n"
0b3d643f HD	401	ASM_EXCEPTIONTABLE_ENTRY(1b,6b)
	402	ASM_EXCEPTIONTABLE_ENTRY(2b,6b)
	403	ASM_EXCEPTIONTABLE_ENTRY(3b,6b)
	404	ASM_EXCEPTIONTABLE_ENTRY(4b,6b)
1da177e4 LT	405	: "=r" (ret)
1da177e4 LT	406	: "r" (val), "r" (regs->ior), "r" (regs->isr)
3fd3a74f	407	: "r19", "r20", "r21", "r22", "r1", FIXUP_BRANCH_CLOBBER );
1da177e4 LT	408	#else
	409	{
	410	unsigned long valh=(val>>32),vall=(val&0xffffffffl);
	411	__asm__ __volatile__ (
	412	" mtsp %4, %%sr1\n"
	413	" zdep %2, 29, 2, %%r19\n"
	414	" dep %%r0, 31, 2, %2\n"
	415	" mtsar %%r19\n"
	416	" zvdepi -2, 32, %%r19\n"
	417	"1: ldw 0(%%sr1,%3),%%r20\n"
	418	"2: ldw 8(%%sr1,%3),%%r21\n"
	419	" vshd %1, %2, %%r1\n"
	420	" vshd %%r0, %1, %1\n"
	421	" vshd %2, %%r0, %2\n"
	422	" and %%r20, %%r19, %%r20\n"
	423	" andcm %%r21, %%r19, %%r21\n"
	424	" or %1, %%r20, %1\n"
	425	" or %2, %%r21, %2\n"
	426	"3: stw %1,0(%%sr1,%1)\n"
	427	"4: stw %%r1,4(%%sr1,%3)\n"
	428	"5: stw %2,8(%%sr1,%3)\n"
	429	" copy %%r0, %0\n"
	430	"6: \n"
	431	" .section .fixup,\"ax\"\n"
	432	"7: ldi -2, %0\n"
	433	FIXUP_BRANCH(6b)
	434	" .previous\n"
0b3d643f HD	435	ASM_EXCEPTIONTABLE_ENTRY(1b,7b)
	436	ASM_EXCEPTIONTABLE_ENTRY(2b,7b)
	437	ASM_EXCEPTIONTABLE_ENTRY(3b,7b)
	438	ASM_EXCEPTIONTABLE_ENTRY(4b,7b)
	439	ASM_EXCEPTIONTABLE_ENTRY(5b,7b)
1da177e4 LT	440	: "=r" (ret)
1da177e4 LT	441	: "r" (valh), "r" (vall), "r" (regs->ior), "r" (regs->isr)
3fd3a74f	442	: "r19", "r20", "r21", "r1", FIXUP_BRANCH_CLOBBER );
1da177e4 LT	443	}
	444	#endif
	445
	446	return ret;
	447	}
	448
	449	void handle_unaligned(struct pt_regs *regs)
	450	{
6ee77658	451	static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5);
1da177e4 LT	452	unsigned long newbase = R1(regs->iir)?regs->gr[R1(regs->iir)]:0;
	453	int modify = 0;
	454	int ret = ERR_NOTHANDLED;
1da177e4 LT	455	register int flop=0; /* true if this is a flop */
1da177e4 LT	456
d0c3be80 HD	457	__inc_irq_stat(irq_unaligned_count);
d0c3be80 HD	458
1da177e4	459	/* log a message with pacing */
f053725b KM	460	if (user_mode(regs)) {
	461	if (current->thread.flags & PARISC_UAC_SIGBUS) {
	462	goto force_sigbus;
	463	}
	464
6ee77658 AM	465	if (!(current->thread.flags & PARISC_UAC_NOPRINT) &&
6ee77658 AM	466	__ratelimit(&ratelimit)) {
1da177e4 LT	467	char buf[256];
1da177e4 LT	468	sprintf(buf, "%s(%d): unaligned access to 0x" RFMT " at ip=0x" RFMT "\n",
19c5870c	469	current->comm, task_pid_nr(current), regs->ior, regs->iaoq[0]);
1da177e4 LT	470	printk(KERN_WARNING "%s", buf);
	471	#ifdef DEBUG_UNALIGNED
	472	show_regs(regs);
	473	#endif
	474	}
f053725b	475
1da177e4 LT	476	if (!unaligned_enabled)
	477	goto force_sigbus;
	478	}
	479
	480	/* handle modification - OK, it's ugly, see the instruction manual */
	481	switch (MAJOR_OP(regs->iir))
	482	{
	483	case 0x03:
	484	case 0x09:
	485	case 0x0b:
	486	if (regs->iir&0x20)
	487	{
	488	modify = 1;
	489	if (regs->iir&0x1000) /* short loads */
	490	if (regs->iir&0x200)
	491	newbase += IM5_3(regs->iir);
	492	else
	493	newbase += IM5_2(regs->iir);
	494	else if (regs->iir&0x2000) /* scaled indexed */
	495	{
	496	int shift=0;
	497	switch (regs->iir & OPCODE1_MASK)
	498	{
	499	case OPCODE_LDH_I:
	500	shift= 1; break;
	501	case OPCODE_LDW_I:
	502	shift= 2; break;
	503	case OPCODE_LDD_I:
	504	case OPCODE_LDDA_I:
	505	shift= 3; break;
	506	}
	507	newbase += (R2(regs->iir)?regs->gr[R2(regs->iir)]:0)<<shift;
	508	} else /* simple indexed */
	509	newbase += (R2(regs->iir)?regs->gr[R2(regs->iir)]:0);
	510	}
	511	break;
	512	case 0x13:
	513	case 0x1b:
	514	modify = 1;
	515	newbase += IM14(regs->iir);
	516	break;
	517	case 0x14:
	518	case 0x1c:
	519	if (regs->iir&8)
	520	{
	521	modify = 1;
	522	newbase += IM14(regs->iir&~0xe);
	523	}
	524	break;
	525	case 0x16:
	526	case 0x1e:
	527	modify = 1;
	528	newbase += IM14(regs->iir&6);
	529	break;
	530	case 0x17:
	531	case 0x1f:
	532	if (regs->iir&4)
	533	{
	534	modify = 1;
	535	newbase += IM14(regs->iir&~4);
	536	}
	537	break;
	538	}
	539
540	/* TODO: make this cleaner... */
541	switch (regs->iir & OPCODE1_MASK)
542	{
543	case OPCODE_LDH_I:
544	case OPCODE_LDH_S:
545	ret = emulate_ldh(regs, R3(regs->iir));
546	break;
547
548	case OPCODE_LDW_I:
549	case OPCODE_LDWA_I:
550	case OPCODE_LDW_S:
551	case OPCODE_LDWA_S:
552	ret = emulate_ldw(regs, R3(regs->iir),0);
553	break;
554
555	case OPCODE_STH:
556	ret = emulate_sth(regs, R2(regs->iir));
557	break;
558
559	case OPCODE_STW:
560	case OPCODE_STWA:
561	ret = emulate_stw(regs, R2(regs->iir),0);
562	break;
563
564	#ifdef CONFIG_PA20
565	case OPCODE_LDD_I:
566	case OPCODE_LDDA_I:
567	case OPCODE_LDD_S:
568	case OPCODE_LDDA_S:
569	ret = emulate_ldd(regs, R3(regs->iir),0);
570	break;
571
572	case OPCODE_STD:
573	case OPCODE_STDA:
574	ret = emulate_std(regs, R2(regs->iir),0);
575	break;
576	#endif
577
578	case OPCODE_FLDWX:
579	case OPCODE_FLDWS:
580	case OPCODE_FLDWXR:
581	case OPCODE_FLDWSR:
582	flop=1;
583	ret = emulate_ldw(regs,FR3(regs->iir),1);
584	break;
585
586	case OPCODE_FLDDX:
587	case OPCODE_FLDDS:
588	flop=1;
589	ret = emulate_ldd(regs,R3(regs->iir),1);
590	break;
591
592	case OPCODE_FSTWX:
593	case OPCODE_FSTWS:
594	case OPCODE_FSTWXR:
595	case OPCODE_FSTWSR:
596	flop=1;
597	ret = emulate_stw(regs,FR3(regs->iir),1);
598	break;
599
600	case OPCODE_FSTDX:
601	case OPCODE_FSTDS:
602	flop=1;
603	ret = emulate_std(regs,R3(regs->iir),1);
604	break;
605
606	case OPCODE_LDCD_I:
607	case OPCODE_LDCW_I:
608	case OPCODE_LDCD_S:
609	case OPCODE_LDCW_S:
610	ret = ERR_NOTHANDLED; /* "undefined", but lets kill them. */
611	break;
612	}
613	#ifdef CONFIG_PA20
614	switch (regs->iir & OPCODE2_MASK)
615	{
616	case OPCODE_FLDD_L:
617	flop=1;
618	ret = emulate_ldd(regs,R2(regs->iir),1);
619	break;
620	case OPCODE_FSTD_L:
621	flop=1;
622	ret = emulate_std(regs, R2(regs->iir),1);
623	break;
1da177e4 LT	624	case OPCODE_LDD_L:
	625	ret = emulate_ldd(regs, R2(regs->iir),0);
	626	break;
	627	case OPCODE_STD_L:
	628	ret = emulate_std(regs, R2(regs->iir),0);
	629	break;
1da177e4 LT	630	}
	631	#endif
	632	switch (regs->iir & OPCODE3_MASK)
	633	{
	634	case OPCODE_FLDW_L:
	635	flop=1;
	636	ret = emulate_ldw(regs, R2(regs->iir),0);
	637	break;
	638	case OPCODE_LDW_M:
	639	ret = emulate_ldw(regs, R2(regs->iir),1);
	640	break;
	641
	642	case OPCODE_FSTW_L:
	643	flop=1;
	644	ret = emulate_stw(regs, R2(regs->iir),1);
	645	break;
	646	case OPCODE_STW_M:
	647	ret = emulate_stw(regs, R2(regs->iir),0);
	648	break;
	649	}
	650	switch (regs->iir & OPCODE4_MASK)
	651	{
	652	case OPCODE_LDH_L:
	653	ret = emulate_ldh(regs, R2(regs->iir));
	654	break;
	655	case OPCODE_LDW_L:
	656	case OPCODE_LDWM:
	657	ret = emulate_ldw(regs, R2(regs->iir),0);
	658	break;
	659	case OPCODE_STH_L:
	660	ret = emulate_sth(regs, R2(regs->iir));
	661	break;
	662	case OPCODE_STW_L:
	663	case OPCODE_STWM:
	664	ret = emulate_stw(regs, R2(regs->iir),0);
	665	break;
	666	}
	667
8b78f260	668	if (ret == 0 && modify && R1(regs->iir))
1da177e4 LT	669	regs->gr[R1(regs->iir)] = newbase;
	670
	671
	672	if (ret == ERR_NOTHANDLED)
	673	printk(KERN_CRIT "Not-handled unaligned insn 0x%08lx\n", regs->iir);
	674
	675	DPRINTF("ret = %d\n", ret);
	676
	677	if (ret)
	678	{
8b78f260 HD	679	/*
	680	* The unaligned handler failed.
	681	* If we were called by __get_user() or __put_user() jump
	682	* to it's exception fixup handler instead of crashing.
	683	*/
	684	if (!user_mode(regs) && fixup_exception(regs))
	685	return;
	686
1da177e4 LT	687	printk(KERN_CRIT "Unaligned handler failed, ret = %d\n", ret);
	688	die_if_kernel("Unaligned data reference", regs, 28);
	689
	690	if (ret == ERR_PAGEFAULT)
	691	{
ccf75290 EB	692	force_sig_fault(SIGSEGV, SEGV_MAPERR,
ccf75290 EB	693	(void __user *)regs->ior, current);
1da177e4 LT	694	}
	695	else
	696	{
	697	force_sigbus:
	698	/* couldn't handle it ... */
ccf75290 EB	699	force_sig_fault(SIGBUS, BUS_ADRALN,
ccf75290 EB	700	(void __user *)regs->ior, current);
1da177e4 LT	701	}
	702
	703	return;
	704	}
	705
	706	/* else we handled it, let life go on. */
	707	regs->gr[0]\|=PSW_N;
	708	}
	709
	710	/*
	711	* NB: check_unaligned() is only used for PCXS processors right
	712	* now, so we only check for PA1.1 encodings at this point.
	713	*/
	714
	715	int
	716	check_unaligned(struct pt_regs *regs)
	717	{
	718	unsigned long align_mask;
	719
	720	/* Get alignment mask */
	721
	722	align_mask = 0UL;
	723	switch (regs->iir & OPCODE1_MASK) {
	724
	725	case OPCODE_LDH_I:
	726	case OPCODE_LDH_S:
	727	case OPCODE_STH:
	728	align_mask = 1UL;
	729	break;
	730
	731	case OPCODE_LDW_I:
	732	case OPCODE_LDWA_I:
	733	case OPCODE_LDW_S:
	734	case OPCODE_LDWA_S:
	735	case OPCODE_STW:
	736	case OPCODE_STWA:
	737	align_mask = 3UL;
	738	break;
	739
	740	default:
	741	switch (regs->iir & OPCODE4_MASK) {
	742	case OPCODE_LDH_L:
	743	case OPCODE_STH_L:
	744	align_mask = 1UL;
	745	break;
	746	case OPCODE_LDW_L:
	747	case OPCODE_LDWM:
	748	case OPCODE_STW_L:
	749	case OPCODE_STWM:
	750	align_mask = 3UL;
	751	break;
	752	}
	753	break;
	754	}
	755
	756	return (int)(regs->ior & align_mask);
	757	}
	758